Anime: - Dragonball Z, Vol. 4 - Pendulum Room

Dragonball Z, Vol. 4 - Pendulum Room Customer Review: Classic
Continuing the story from Snake Way, Pendulum Room concentrates on the efforts of all the Z fighters as they prepare for the arrival of the coming Saiyans. Though Goku, Gohan, and Piccolo rightfully retain most of the attention, the other Z fighters training with Kami will play a vital role in the coming conflict. In the Pendulum Room, the headstrong arrogant group is deeply humbled by their defeat at the hands of the "weaker" Saiyans (weaker than the looming Vegeta and Nappa) that assault them. This lesson in humility spurs them to continue their training and, in my mind, serves to better prepare them for their eventual deaths at the hands of the Saiyans.

Note that this is the 'cut', English-dubbed version. I prefer it such, but others do not, so buy with care.
Customer Review: Pendulum Room
This is a must have in the Dragon Ball Z DVD set. Goku finally reaches his destination and starts his training. The Z fighters on earth train at Kame's palace in the pendulum room, where they fight Saiyans from the past. Meanwhile Gohan gets entranced by a Saiyan spacepod and he and Piccolo go on an all out fight. This gets to the Dragon Ball Z bascis, which is fighting, lots of fighting. The Z fighters against the old Saiyans is great, but the best is the Piccolo and Gohan fight. Goku's training is quite humorous and one laughs at King Kai's methods. Definetly a must buy, you'll thank me after watching it.